chore: update captureExceptions docs

[david-luna]

This PR adds a paragraph for unhandledRejections since they are already handled if --unhandled-rejections Node option is set to strict or throw (the default on Node 15+).

fixes #2366

Checklist

• Implement code
• Add tests
• Update TypeScript typings
• Update documentation
• Add CHANGELOG.asciidoc entry
• Commit message follows commit guidelines

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• Start Time: 2023-03-13T18:05:55.408+0000

• Duration: 4 min 1 sec

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• Description: approval-list/elastic/apm-agent-nodejs.yml

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• Description: githubApiCall: The REST API call https://api.github.com/orgs/elastic/members/david-luna return the message : java.lang.Exception: httpRequest: Failure connecting to the service https://api.github.com/orgs/elastic/members/david-luna : httpRequest: Failure connecting to the service https://api.github.com/orgs/elastic/members/david-luna : Code: 404Error: {"message":"User does not exist or is not a member of the organization","documentation_url":"https://docs.github.com/rest/reference/orgs#check-organization-membership-for-a-user"}

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